﻿/*
 * Catalyst - http://catalystobjects.com
 * 
 * New BSD License (BSD)
 * 
 * Copyright (c) 2009, Ashley Brener
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 * 
 * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of Midlet Earth nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Schema;

namespace Catalyst.Xml
{
	public class ValidationService
	{
		/// <summary>
		/// Occurs when the ValidationService encounters validation errors.
		/// </summary>
		public event ValidationEventHandler ValidationEventHandler;

		/// <summary>
		/// Validates an XmlDocument against a single XmlSchema
		/// </summary>
		/// <param name="XmlDocument"></param>
		/// <param name="TargetNamespace"></param>
		/// <param name="SchemaUri"></param>
		public void Validate(XmlDocument XmlDocument, string TargetNamespace, string SchemaUri)
		{
			XmlSchemaSet schemas = new XmlSchemaSet();
			schemas.Add(TargetNamespace, SchemaUri);

			Validate(XmlDocument, schemas);
		}

		/// <summary>
		/// Validates an XmlDocument against an XmlSchemaSet
		/// </summary>
		/// <param name="XmlDocument"></param>
		/// <param name="Schemas"></param>
		public void Validate(XmlDocument XmlDocument, XmlSchemaSet Schemas)
		{
			StringBuilder sb = new StringBuilder();
			XmlTextWriter writer = new XmlTextWriter(new StringWriter(sb));
			XmlDocument.WriteTo(writer);

			Validate(sb.ToString(), Schemas);
		}

		/// <summary>
		/// Validates an Xml string against a single XmlSchema
		/// </summary>
		/// <param name="Xml"></param>
		/// <param name="TargetNamespace"></param>
		/// <param name="SchemaUri"></param>
		public void Validate(string Xml, string TargetNamespace, string SchemaUri)
		{
			XmlSchemaSet schemas = new XmlSchemaSet();
			schemas.Add(TargetNamespace, SchemaUri);

			Validate(Xml, schemas);
		}

		/// <summary>
		/// Validates an Xml string against an XmlSchemaSet
		/// </summary>
		/// <param name="Xml"></param>
		/// <param name="Schemas"></param>
		public void Validate(string Xml, XmlSchemaSet Schemas)
		{
			MemoryStream ms = new MemoryStream();
			StreamWriter writer = new StreamWriter(ms);
			writer.Write(Xml);

			XmlReaderSettings xReaderSettings = new XmlReaderSettings();
			xReaderSettings.ValidationType = ValidationType.Schema;
			xReaderSettings.Schemas = Schemas;
			xReaderSettings.ValidationEventHandler += ValidationEventHandler;

			ms.Position = 0;
			XmlReader xReader = XmlReader.Create(ms, xReaderSettings);

			XmlDocument xDoc = new XmlDocument();
			xDoc.Load(xReader);

			writer.Close();
			ms.Close();
		}
	}
}
